Exhaust Device Heat Insulating Material Opening Placement
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Solution Overview
Problem
Conventional exhaust-gas purifying devices face challenges in maintaining heat retention while ensuring proper support rigidity, particularly when multiple opening portions for supporting members are required, which can lead to heat loss and weight imbalance issues.
Innovation Solution
The exhaust device incorporates a heat insulating material with strategically placed opening portions to support catalysts, specifically positioning these openings at the downstream side of the second catalyst to improve support rigidity and minimize heat loss, while also using additional supporting members to balance weight and enhance compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple opening portions for supporting members are provided at the heat insulating material, then support rigidity is improved, but heat release increases
Solution Approach 1:
The patent applies local quality by strategically positioning opening portions at specific locations on the heat insulating material - specifically at the downstream side of the second catalyst and at both sides in the cylinder row direction. This localized placement provides necessary support rigidity only where structurally required, while minimizing the total opening area to reduce heat release from the exhaust-gas purifying device.
2Stability of the object's composition
If the second catalyst is positioned offset from the center to balance weight, then weight balance is improved, but device complexity increases
Solution Approach 1:
The patent employs asymmetry by positioning the second catalyst offset from the center in the cylinder row direction, specifically towards one side to balance the weight distribution of the exhaust device. The opening portions are correspondingly positioned at both sides of the second catalyst in the cylinder row direction, creating an asymmetric but balanced structural configuration that improves weight balance without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses heat release, enhances support rigidity, and maintains efficient exhaust gas purification performance by strategically placing supporting members to balance weight and reduce heat loss, thereby improving the overall performance and longevity of the exhaust system.
Implementation Method 1
a heat insulating material covering the exhaust manifold, the first catalyst, and the second catalyst
Data Source
AI summary
A downstream-side heat insulating material which is provided at a side face of a GPF which is positioned on a downstream side, in an exhaust-gas flowing direction, of plural in-line arranged catalysts has a first opening portion and a second opening portion which are provided for attaching supporting members.